From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 12 Nov 2009 09:33:09 +0000 (+0000)
Subject: inetpeer: Optimize inet_getid()
X-Git-Tag: v2.6.33-rc1~388^2~376
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c1409a0a2b88585ec0c03f1de0aafa178c56313;p=pandora-kernel.git

inetpeer: Optimize inet_getid()

While investigating for network latencies, I found inet_getid() was a
contention point for some workloads, as inet_peer_idlock is shared
by all inet_getid() users regardless of peers.

One way to fix this is to make ip_id_count an atomic_t instead
of __u16, and use atomic_add_return().

In order to keep sizeof(struct inet_peer) = 64 on 64bit arches
tcp_ts_stamp is also converted to __u32 instead of "unsigned long".

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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